J/A+A/588/L6ivo://CDS.VizieR/J/A+A/588/L6doi:10.26093/cds/vizier.35889006CDSMaciejewski G.Dimitrov D.Fernandez M.Sota A.Nowak G.Ohlert J.,Nikolov G.Bukowiecki L.Hinse T.C.Palle E.Tingley B.,Kjurkchieva D.Lee J.W.Lee C.-U.2017-06-19T07:57:08Z2016-03-16T07:34:35ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frmultiple-starssolar-system-planetsccd-photometryMost hot Jupiters are expected to spiral in toward their host stars because the angular momentum of the orbital motion is transferred to the stellar spin. Their orbits can also precess as a result of planet-star interactions. Calculations show that both effects might be detected for the very-hot exoplanet WASP-12 b using the method of precise transit-timing over a time span of about 10yr. We acquired new precise light curves for 29 transits of WASP-12 b, spanning four observing seasons from November 2012 to February 2016. New mid-transit times, together with those from the literature, were used to refine the transit ephemeris and analyze the timing residuals. We find that the transit times of WASP-12 b do not follow a linear ephemeris with a 5-{sigma} confidence level. They may be approximated with a quadratic ephemeris that gives a change rate in the orbital period of (-2.56+/-0.40)x10^-2^s/yr. The tidal quality parameter of the host star was found to be equal to 2.5x10^5^, which is similar to theoretical predictions for Sun-like stars. We also considered a model in which the observed timing residuals are interpreted as a result of the apsidal precession. We find, however, that this model is statistically less probable than the orbital decay.2016A&A...588L...6Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/588/L6CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/720/872 : A spectropolarimetric analysis of WASP-12 (Fossati+, 2010)J/A+A/528/A65 : WASP-12b transits (Maciejewski+, 2011)J/A+A/551/A108 : Multi-site obs. of WASP-12 b transit (Maciejewski+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/588/L6https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/588/L6http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/588/L6https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/588/L6https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/588/L6http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/588/L6GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/588/L6/w12rerRe-reduced light curves from literatureFilt[RV- ] Filter namemeta.id;instr.filtercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date in Barycentric Dynamical Time (BJD-2450000)dtime.epochdoubleFluxNormalized fluxphot.flux;arith.ratiodoublee_FluxFlux errorstat.error;phot.fluxdoubleTelCodeTelescope codemeta.id;instr.telcharJ/A+A/588/L6/w12newNew light curves for transits of WASP-12 brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date in Barycentric Dynamical Time (BJD-2450000)dtime.epochdoubleFluxNormalized fluxphot.flux;arith.ratiodoublee_FluxFlux errorstat.error;phot.fluxdoubleTelCodeTelescope codemeta.id;instr.telcharFilt[RV- ] Filter namemeta.id;instr.filterchar